Suggestions please on a small desktop CNC, lead screws or belt drive?

[Tanky_Turk]

Just looking at ball screws on EBAY, what does "1204-3" mean?

I take it 12 is the diameter and 3 the pitch maybe? What's the 4?

[JAZZCNC]

Just looking at ball screws on EBAY, what does "1204-3" mean?

I take it 12 is the diameter and 3 the pitch maybe? What's the 4?

Nearly 12=dia 04=pitch 3 Could be number of thread starts.? . . Can you post a link.?

If your wanting this screw for CNC router for wood etc then you don't want a 4mm pitch has it will be very slow. 10mm is better but you'll probably only find 16mm diameter.